Micrel, Inc.
5V/3.3V 32-1250Mbps AnyRate
®
SY87701V
SY87701V
CLOCK AND DATA RECOVERY
Use lower-power SY87701AL for 3.3V systems
FEATURES
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3.3V and 5V power supply options
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Clock and data recovery from 32Mbps up to
1.25Gbps NRZ data stream, clock generation from
32Mbps to 1.25Gbps
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Complies with Bellcore, ITU/CCITT and ANSI
specifications for applications such as OC-1, OC-3,
OC-12, ATM, FDDI, Fibre Channel and Gigabit
Ethernet, as well as proprietary applications
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Two on-chip PLLs: one for clock generation and
another for clock recovery
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Selectable reference frequencies
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Differential PECL high-speed serial I/O
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Line receiver input: no external buffering needed
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Link fault indication
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100K ECL compatible I/O
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Available in 32-pin EPAD-TQFP and 28-pin SOIC
packages (28-pin SOIC is available, but not
recommended for new designs, see page 2 for
details
AnyRate
®
DESCRIPTION
The SY87701V is a complete Clock Recovery and Data
Retiming integrated circuit for data rates from 32Mbps
up to 1.25Gbps NRZ. The device is ideally suited for
SONET/SDH/ATM and Fibre Channel applications and
other high-speed data transmission systems.
Clock recovery and data retiming is performed by
synchronizing the on-chip VCO directly to the incoming
data stream. The VCO center frequency is controlled by
the reference clock frequency and the selected divide
ratio. On-chip clock generation is performed through the
use of a frequency multiplier PLL with a byte rate source
as reference.
The SY87701V also includes a link fault detection
circuit.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
APPLICATIONS
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s
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SONET/SDH/ATM OC-1, OC-3, OC-12, OC-24
Fibre Channel, Escon, SMPTE 259
Gigabit Ethernet/Fast Ethernet
Proprietary architecture up to 1.25Gbps
BLOCK DIAGRAM
PLLR P/N
RDOUTP
(PECL)
RDOUTN
RCLKP
(PECL)
RCLKN
RDINP
(PECL)
RDINN
PHASE
DETECTOR
0
1
PHASE/
FREQUENCY
DETECTOR
LINK
FAULT
DETECTOR
CHARGE
PUMP
VCO
CD
(PECL)
REFCLK
(TTL)
LFIN
(TTL)
PHASE/
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
1
0
TCLKP
(PECL)
TCLKN
V
CC
V
CCA
V
CCO
GND
DIVIDER
BY 8, 10, 16, 20
SY87701V
DIVSEL 1/2
(TTL)
PLLS P/N
FREQSEL 1/2/3
(TTL)
CLKSEL
(TTL)
AnyRate is a registered trademark of Micrel, Inc.
M9999-073008
hbwhelp@micrel.com or (408) 955-1690
Rev.: O
Amendment: /0
1
Issue Date: July 2008
MICREL [ MICREL SEMICONDUCTOR ]
